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2 years ago

Examine the system of equations -3x+y=4, -9x+5y=-1 what is the solution

2 answers:

5 0

Answer: x=-7/2 y=29/2

Steps:

Use the elimination method

Multiply -3x+y=4 by 5 to make the coefficient next to the y in both equations the same

5(-3x+y=4)

-15x+5y=20

Then, subtract to eliminate the y

-15x+5y=20
- -9x+5y=-1

= -6x=21
Divide both sides by -6 to isolate x

= x= -7/2

Next substitute -7/2 into x in one of the equations

-3(-7/2)+y=4

-21/2+y=4

Add 21/2 from both sides to isolate y

y=29/2

Evgesh-ka [11]2 years ago

3 0

Answer:

sorry i know im late but here

Step-by-step explanation:

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The circumference of a circle can be found using the formula C = 2r. Which is an equivalent equation solved for r? r = C r = C(2

vaieri [72.5K]

Answer:

r equals StartFraction C Over 2 pi EndFraction

Step-by-step explanation:

we know that

The circumference of a circle is equal to

$C=2\pi r$

where

r is the radius of the circle

Solve for r

That means -----> isolate the variable r

Divide by 2π both sides

$\frac{C}{2\pi}=\frac{2\pi r}{2\pi}$

Simplify right side

$\frac{C}{2\pi}=r$

Rewrite

$r=\frac{C}{2\pi}$

r equals StartFraction C Over 2 pi EndFraction

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Shkiper50 [21]

Answer:

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Step-by-step explanation:

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3 years ago

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Solnce55 [7]

Answer:

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Step-by-step explanation:

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2 years ago

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Answer:

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2 years ago

What are the solutions to the system of equations?

user100 [1]

Solve the second equation using the given choices:

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Replacing x with the given choices and matching the y values the answer is the second choice

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3 years ago